Pulse argon arc welding machine and TIG-I type control circuit

Abstract

The invention relates to the technical field of welding equipment control, in particular to a pulse argon arc welding machine TIG-I type control circuit which comprises a power supply management module, an integrated voltage stabilizer U6 and a voltage stabilizer U2, an input + 24V power supply is converted into + 3.3 V and + 5V, the output end is connected with a filter capacitor in parallel, the overheating state is detected through a thermoswitch RT2 and an optocoupler U4, and an interrupt signal E01 is triggered; the high-frequency control module receives an external switching signal GAOP-IN / OFF, isolates and drives a relay KT1 through a transistor Q1 and an optocoupler D6, and controls on-off of external equipment; the dynamic feedback module adopts an operational amplifier U8A to construct a voltage follower, and voltage division networks R31 and R32 adjust the welding voltage in real time and compensate input fluctuation; and the welding gun state detection module is coupled with a welding gun switching signal through a transformer L1 and outputs an SKG-ON / OFF signal to the main control chip GD32F103RCT6 after the welding gun switching signal is detected by a chip U4, and all the modules cooperatively work through an MOS (Metal Oxide Semiconductor) tube, a PC817, an electrical connection X8 interface and an electrical connection X6 interface. The technical problems that traditional equipment is sensitive in voltage fluctuation and single in protection mechanism are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment control, and more specifically, to a pulsed argon arc welding machine and a TIG-I type control circuit. Background Art

[0002] As a high-precision welding equipment, the control circuit of a pulsed argon arc welding machine usually consists of a voltage regulation module, a pulse generation module and a protection unit. In the prior art, a linear voltage regulator or a switching power supply module is used to achieve basic voltage stability, an analog circuit or a fixed program controller is used to adjust welding pulse parameters, and a mechanical thermal relay or a fuse is relied on to provide overcurrent and overheat protection.

[0003] In the actual operation process, it often occurs that the single-machine voltage stabilization circuit is difficult to cope with the power supply fluctuations and load changes during the welding process, resulting in poor arc stability and affecting the welding quality. Therefore, it is necessary to provide a pulsed argon arc welding machine with high stability and easy control. Summary of the Invention

[0004] The present invention aims to solve the problems that the input voltage is unstable during the welding process, affecting the arc stability and resulting in inconsistent weld quality. In view of the above-mentioned defects of the prior art, the present invention provides a pulsed argon arc welding machine and a TIG-I type control circuit.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0006] On the one hand

[0007] A TIG-I type control circuit of a pulsed argon arc welding machine, characterized by comprising:

[0008] A power management module, integrating a voltage regulator U6 and a voltage regulator U2, converting the input +24V power supply into +3.3V and +5V, with the output terminals being connected in parallel with filter capacitors C1-C7, EC1-EC4, and detecting the overheat state through a thermal switch RT2 and an optocoupler PC817 (U4) to trigger an interrupt signal E01;

[0009] A high-frequency control module, receiving an external switch signal GAOP-IN / OFF, isolating and driving a relay KT1 through a transistor Q1 and a MOS transistor D6 to control the on / off of an external device;

[0010] A dynamic feedback module, constructing a voltage follower using an LM358 operational amplifier U8A, and a voltage dividing network R31, R32 adjusts the welding voltage in real time to compensate for input fluctuations;

[0011] A torch state detection module, coupling a torch switch signal through a transformer VHR-02 (L1), and outputting a SKG-ON / OFF signal to a main control chip GD32F103RCT6 after detection by a chip U4;

[0012] Each of the above modules works together through MOS transistors, PC817, and electrical connections to X8 and X6 interfaces.

[0013] Preferably, one end of the thermal switch X2 is connected to the +15V power supply, and the other end is grounded through a series capacitor C50. The state of the thermal switch X2 controls the conduction of the primary side of the optocoupler PC817; the secondary side of the optocoupler PC817 (U2) is pulled up to VCC + 3.3V through a resistor R20, and an "overheat E01" signal is output to the interrupt pin PD0 of the main control chip; a capacitor C39 is connected in parallel between the +15V input terminal and the ground to filter out high-frequency noise;

[0014] The input terminal of the voltage regulator U2 is connected to the +24V power supply through a fuse F1, and the output terminal is connected in parallel with capacitors C3 and EC3.

[0015] Preferably, the base of the transistor Q1 is connected to the GAOP-IN / OFF signal through a resistor R1, the emitter is grounded, and the collector drives the primary side of the MOS transistor D6 through a resistor R77;

[0016] The secondary side of the MOS transistor D6 controls the relay KT1 coil after being connected in series with a freewheeling diode D3, and the relay contact is connected to the solenoid valve load of the XHR-02 interface X8.

[0017] Preferably, the non-inverting input terminal of the LM358 operational amplifier U8A is connected to the voltage division node through a resistor R31, the inverting input terminal is connected to the reference voltage through a resistor R32, and the output terminal is filtered through a capacitor C44 and then output to the DAC terminal;

[0018] In the voltage division network, the ratio of the resistors R31 to R32 is 15:1, and in combination with C44, voltage fluctuation compensation at the 10ms level is achieved.

[0019] Preferably, the primary side of the transformer VHR-02 is connected in series with a PTC-12R overcurrent protection, and the secondary side is coupled to the detection pin of the chip U4 through a resistor R6 and a capacitor C11;

[0020] The SKG-ON / OFF signal output from the chip U4 is pulled up to +3.3V through a resistor R15 and then connected to the PD0 pin of the main control chip.

[0021] Preferably, it further includes a storage module. The chip U3 is connected to the PB6 / PB7 pins of the main control chip through the I 2 2C bus SCL and SDA to store welding parameters.

[0022] Preferably, the main control chip GD32F103RCT6 controls the DAC output through the SPI bus:

[0023] After the output signal of the DAC is electrically isolated by configuring the LM358 operational amplifier U8A as a voltage follower, it is pulled up to +3.3V through the resistor R47 and output to the DAC pin of the main control chip GD32F103RCT6, driving the base of the transistor Q6 at the MMA signal control end to adjust the feedback voltage Read Voltage AD.

[0024] On the other hand

[0025] A pulsed argon arc welder is provided with any one of the pulsed argon arc welder TIG-I type control circuits described above.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. Through precise voltage and current feedback and the DA control module, precise adjustment of welding parameters is achieved, improving welding accuracy.

[0028] 2. High-frequency arc starting and stable power management improve welding efficiency and shorten welding time.

[0029] 3. The overcurrent and overheat protection modules effectively prevent the welder from being damaged due to overload or overheating, improving the safety of the welder.

[0030] 4. With the GD32F103RCT6 main control chip as the core, modules such as high-frequency control, solenoid valve drive, torch detection, power management, storage and communication are integrated to form a closed-loop control system. The input signals GAOP-IN / OFF and GAS-ON / OFF are conditioned and then parsed by the main control chip to trigger corresponding actions such as relay switching and solenoid valve drive. At the same time, voltage, current, and temperature data are collected in real time to dynamically adjust the output. Among them, anti-interference and stability designs are provided, including electrical isolation, MOS transistors, PC817, and the transformer VHR-02 to isolate control signals from high-voltage loads and prevent noise coupling; redundant protection, freewheeling diodes D1 / D6 / D7 suppress back electromotive force, the thermal switch RT2 and the overheat signal E01 trigger the protection mechanism, and dynamic feedback, the LM358 operational amplifier compensates for voltage fluctuations in real time to ensure arc stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will further explain the present invention in conjunction with the drawings and embodiments. The drawings in the following description are only partial embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts:

[0032] Figure 1 It is the schematic diagram of the pulsed argon arc welder TIG-I type control device in the embodiment of the present application.

[0033] Figure 2 It is the circuit diagram of the control circuit of the pulsed argon arc welding machine TIG-I type in the embodiment of the present application.

[0034] Figure 3 It is the circuit diagram of the power management module in the embodiment of the present application.

[0035] Figure 4 It is the circuit diagram of the high-frequency control module in the embodiment of the present application.

[0036] Figure 5 and Figure 6 It is the circuit diagram of the dynamic feedback module in the embodiment of the present application.

[0037] Figure 7 It is the circuit diagram of the torch status detection module in the embodiment of the present application.

[0038] Figure 8 It is the circuit diagram of the storage module in the embodiment of the present application.

[0039] Figure 9 It is the circuit diagram of the main control chip GD32F103RCT6 of U5 in the embodiment of the present application.

[0040] Figure 10 It is the circuit diagram of the solenoid valve drive module in the embodiment of the present application. Specific embodiments

[0041] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment 1

[0043] As shown in Figures 1 to 9 a control circuit of a pulsed argon arc welding machine TIG-I type includes a power management module, a high-frequency control module, a dynamic feedback module, a torch status detection module, a main control chip, a storage module, and a solenoid valve drive module.

[0044] The U5 main control chip is used to coordinate the operation of each module, process sensor data and execute control strategies; the U5 main control chip GD32F103RCT6 controls the DAC output through the SPI bus: the signal output by the DAC is electrically isolated by configuring the LM358 operational amplifier U8A as a voltage follower, pulled up to +3.3V through the resistor R47, and output to the DAC pin of the main control chip GD32F103RCT6 to drive the base of the Q6 transistor at the MMA signal control end, adjusting the feedback voltage Read Voltage AD.

[0045] The power management module integrates the voltage regulator U6 and the voltage regulator U2, converts the input +24V power supply into +3.3V and +5V, and the output terminals are connected in parallel with the filter capacitors C1 - C7, EC1 - EC4, and detect the overheat state through the thermal switch X2 and the optocoupler PC817 (U4) to trigger the interrupt signal E01. One end of the thermal switch X2 in the power management module is connected to the +15V power supply, and the other end is grounded through the series capacitor C50. The state of the thermal switch X2 controls the conduction of the primary side of the optocoupler PC817; the secondary side of the optocoupler PC817 (U2) is pulled up to VCC +3.3V through the resistor R20, and outputs the "overheat E01" signal to the interrupt pin PD0 of the main control chip; the capacitor C39 is connected in parallel between the +15V input terminal and the ground to filter out high-frequency noise; the input terminal of the voltage regulator U2 is connected to the +24V power supply through the fuse F1, and the output terminal is connected in parallel with the capacitors C3 and EC3.

[0046] The high-frequency control module controls the high-frequency output through the input signal to realize the switching action of the solenoid valve; the high-frequency control module receives the external switch signal GAOP-IN / OFF, isolates and drives the relay KT1 through the transistor Q1 and the optocoupler 4N10 (D6) to control the on / off of the external device; the base of the transistor Q1 in the high-frequency control module is connected to the GAOP-IN / OFF signal through the resistor R1, the emitter is grounded, and the collector drives the primary side of the MOS tube D6 through the resistor R77; the secondary side of the MOS tube D6 controls the relay KT1 coil after being connected in series with the freewheeling diode D3, and the relay contact is connected to the solenoid valve load of the XHR-02 interface X8.

[0047] The dynamic feedback module uses the LM358 operational amplifier U8A to construct a voltage follower, and the voltage division network R31, R32 adjusts the welding voltage in real time to compensate for the input fluctuation; the non-inverting input terminal of the LM358 operational amplifier U8A in the dynamic feedback module is connected to the voltage division node through the resistor R31, the inverting input terminal is connected to the reference voltage through the resistor R32, and the output terminal is filtered through the capacitor C44 and then output to the DAC terminal; in the voltage division network, the ratio of the resistor R31 to R32 is 15:1, and the combination of C44 realizes the voltage fluctuation compensation at the 10ms level.

[0048] The torch status detection module is used to detect the torch switch status and prevent misoperation. The torch status detection module couples the torch switch signal through the transformer VHR-02 (L1), and after being detected by the chip U4, outputs the SKG-ON / OFF signal to the main control chip GD32F103RCT6. In the torch status detection module, the primary side of the transformer VHR-02 is connected in series with the PTC-12R overcurrent protection, and the secondary side is coupled to the detection pin of the chip U4 through the resistor R6 and the capacitor C11. The SKG-ON / OFF signal at the output end of the chip U4 is pulled up to +3.3V through the resistor R15 and then connected to the PD0 pin of the main control chip.

[0049] The storage module is used to save welding parameters and support firmware upgrade. For the storage module, the chip U3 is connected to the PB6 / PB7 pins of the main control chip through the I 2 C bus SCL and SDA to store welding parameters.

[0050] The solenoid valve drive module is used to control the on / off of the DC24V solenoid valve, protect the load and isolate interference. In the solenoid valve drive module, the GAS-ON / OFF signal is amplified by two stages of Q3 and Q4 to drive the solenoid valve at the USIG end. The freewheeling diodes D6 / D7 protect the circuit, and the optocoupler EC6 isolates the control end from the load end.

[0051] Each module works together through MOS transistors, PC817 and the electrical connection interfaces X8 and X6 to solve the problems of arc instability and inconsistent weld quality caused by input voltage fluctuations.

[0052] Embodiment 2

[0053] A pulsed argon arc welding machine is provided with any one of the TIG-I type control circuits of the pulsed argon arc welding machine in Embodiment 1.

[0054] The implementation principle of the TIG-I type control circuit of the pulsed argon arc welding machine in the embodiment of the present application is as follows: with the GD32F103RCT6 main control chip as the core, integrating high-frequency control, solenoid valve drive, torch detection, power management, storage communication and other modules to form a closed-loop control system. The input signals GAOP-IN / OFF and GAS-ON / OFF are conditioned and then parsed by the main control chip to trigger corresponding actions such as relay switching and solenoid valve drive. At the same time, voltage, current and temperature data are collected in real time to dynamically adjust the output. Among them, anti-interference and stability designs are provided, including electrical isolation, MOS transistors, PC817 and the transformer VHR-02 to isolate the control signal from the high-voltage load to prevent noise coupling; redundant protection, freewheeling diodes D1 / D6 / D7 suppress back electromotive force, the thermal switch RT2 and the overheat signal E01 trigger the protection mechanism and dynamic feedback, and the LM358 operational amplifier compensates for voltage fluctuations in real time to ensure arc stability.

[0055] It should be understood that those of ordinary skill in the art can make improvements or modifications based on the above description, and all such improvements and modifications shall fall within the scope of protection of the appended claims of the present invention.

Claims

1. A control circuit for a pulsed argon arc welding machine TIG-I type, characterized in that, Including: A power management module integrating a voltage regulator U6 and a voltage regulator U2, which converts the input +24V power supply into +3.3V and +5V. The output terminals are connected in parallel with filter capacitors C1 - C7, EC1 - EC4, and the overheat state is detected through a thermal switch X2 and an optocoupler PC817 (U2) to trigger an interrupt signal E01; A high - frequency control module that receives an external switch signal GAOP - IN / OFF, isolates and drives a relay KT1 through a transistor Q1 and a MOS transistor D6 to control the on - off of an external device; A dynamic feedback module that uses an LM358 operational amplifier U8A to construct a voltage follower, and a voltage - dividing network R31, R32 adjusts the welding voltage in real time to compensate for input fluctuations; A torch state detection module that couples the torch switch signal through a transformer VHR - 02 (L1), and after being detected by a chip U4, outputs a SKG - ON / OFF signal to the main control chip GD32F103RCT6; Each of the above - mentioned modules works together through MOS transistors, PC817, and electrical connection interfaces X8, X6.

2. The control circuit of a pulsed argon arc welding machine TIG-I type according to claim 1, characterized in that, One end of the thermal switch X2 is connected to the +15V power supply, and the other end is grounded through a series - connected capacitor C50. The state of the thermal switch X2 controls the conduction of the primary side of the optocoupler PC817; the secondary side of the optocoupler PC817 (U2) is pulled up to VCC + 3.3V through a resistor R20, and outputs an "overheat E01" signal to the interrupt pin PD0 of the main control chip; a capacitor C39 is connected in parallel between the +15V input terminal and the ground to filter out high - frequency noise; The input terminal of the voltage regulator U2 is connected to the +24V power supply through a fuse F1, and the output terminal is connected in parallel with a capacitor C3 and an EC3.

3. A control circuit of a pulsed argon arc welding machine TIG-I type according to claim 1, characterized in that, The base of the transistor Q1 is connected to the GAOP - IN / OFF signal through a resistor R1, the emitter is grounded, and the collector drives the primary side of the MOS transistor D6 through a resistor R77; The secondary side of the MOS transistor D6 controls the relay KT1 coil after being connected in series with a free - wheeling diode D3, and the relay contact is connected to the solenoid valve load of the XHR - 02 interface X8.

4. The control circuit of a pulsed argon arc welding machine TIG-I type according to claim 1, characterized in that, The non - inverting input terminal of the LM358 operational amplifier U8A is connected to a voltage - dividing node through a resistor R31, the inverting input terminal is connected to a reference voltage through a resistor R32, and the output terminal is filtered through a capacitor C44 and then output to the DAC terminal; In the voltage - dividing network, the ratio of the resistor R31 to R32 is 15:1, and in combination with C44, it realizes voltage fluctuation compensation at the 10ms level.

5. A control circuit for a pulsed argon arc welding machine TIG-I type according to claim 1, characterized in that, The primary side of the transformer VHR - 02 is connected in series with a PTC - 12R over - current protection, and the secondary side is coupled to the detection pin of the chip U4 through a resistor R6 and a capacitor C11; The SKG - ON / OFF signal output by the chip U4 is pulled up to +3.3V through a resistor R15 and then connected to the PD0 pin of the main control chip.

6. The control circuit of a pulsed argon arc welding machine TIG-I type according to claim 1, characterized in that, It also includes a storage module. The chip U3 is connected to the master control chip PB6 / PB7 pins through the I 2 2C bus SCL and SDA to store the welding parameters.

7. The control circuit of a pulsed argon arc welding machine TIG-I type according to claim 1, characterized in that, The main control chip GD32F103RCT6 controls the DAC output through the SPI bus: After the output signal of the DAC is electrically isolated through the LM358 operational amplifier U8A configured as a voltage follower, it is pulled up to +3.3V through the resistor R47 and output to the DAC pin of the main control chip GD32F103RCT6, driving the base of the Q6 transistor at the MMA signal control end to adjust the feedback voltage Read Voltage AD.

8. A pulsed argon arc welding machine, characterized in that, The pulse argon arc welding machine is provided with the TIG-I type control circuit of the pulse argon arc welding machine as described in any one of claims 1-8.

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